Flask for dental purposes



June 7, 1938; H. KONIGSMANN FLASK FOR DENTAL PURPOSES Filed Aug. 19, 1957 .772 0:72 for Patented June 7, 1938 UNITED STATES PATENT OFFICE FLASK FOR DENTAL PURPOSES Herbert Kiinigsmann, Schoneberg, Berlin, Germany 2 Claims.

This invention relates to a flask for dental purposes, more particularly for pressing dental plates from products of polymerization.

Heretofore it has been usual to employ for pressing dental plates from polymerization products presses which are capable of being heated. These presses have the disadvantage that a special pre-heating of the two halves of the flask is necessary before the commencement of the pressing operation, in order that the heat of the dies of the press can be utilized in the main for rendering plastic the filling of the flask. It has also been proposed to provide heating means in direct fashion in the bottoms of the two halves of the flask, but the plates therein are unable to cool sufliciently quickly, as the heat in the heating devices must again dissipate before a cooling effeet can be exerted on the pressed plate. If the heatable bottoms are screwed on, these can only be removed by releasing at the same time the coupling between the rings of the flask.

To obviate these disadvantages the arrangement according to the invention is such that in the case of flask rings which are capable of being coupled together the bottoms carrying the electrical heating resistances are capable of being applied loosely to the rings of the flask over guide rods or the like mounted on the said rings. This arrangement not only permits of immediate removal of the bottoms with the heating resistances after completion of the pressing operation, with immediate cooling of the rings with the bottoms removed having the plate enclosed in the plaster mould, but also has the advantage that when the plaster is filled into the two halves of the flask the bottoms having the sensitive heating resistances can be temporarily replaced by full bottoms, which after the hardening of the plaster mould can be readily exchanged for the electrically heated bottoms for the purpose of drying the hardened plaster. Since the rings can be coupled together independently of the bottoms, the pressed plate may be allowed to cool immediately after completion of the pressing operation and after the coupling has been made effective between the rings.

Since the press no longer requires to be preheated and the drying of the plaster mould is performed by means of the heating elements which also serve to render plastic the material of the plate, and since the cooling of the pressed plate may be allowed to commence immediately after completion of the pressing operation, the invention permits of a considerable saving in time in the production of dental plates of the kind in question.

Further, since the heat source is situated much nearer to thematerial of the plate than in presses of the preheated type it is possible to obtain a 5 more even heating of the material and to ensure that the critical temperature in respect of polymerization products is not exceeded.

The invention is illustrated by way of example in the accompanying drawing, in which 10 Fig. 1 is an elevational View of a flask according to the invention. The rings of the flask are coupled together and the bottoms rest loosely on the rings.

Fig. 2 is an elevational view partially in section 15 and shows the bottoms wholly or partially lifted from the rings.

Fig. 3 is a plan view of the flask according to Fig. 1, and

Fig. 4 is a view corresponding to Fig. 1 in 20 which the heated bottoms have been replaced by non-heated bottoms produced in one piece.

The rings I and 2 are capable of being coupled together by means of cramps 3, 3, which engage over dovetail ledges la and 211 on. the rings and 5 exert a clamping effect on the diverging faces of the ledges when they are driven over these faces by means of a hammer. To the rings l and 2 there are secured by means of screws 4a guide members 4, which engage in corresponding re- 3 cesses in the rings l and 2 and the bottoms 5 and 6 and hold these parts in their exact superimposed position. When the cramps 3, 3 are driven on to the ledges la, 2a merely the rings I and 2 are firmly connected, whilst the bottoms 35 5 and 6 can be readily removed from the rings in the direction of the guide members 4 and just as readily again replaced.

In the bottoms 5 and 6 there are provided in the conventional manner electric heating ele- 4O ments 5a and 6a, which are connected with the terminals 9, I0 and I I and are accessible by way of the screwed down plates 5?) and 6b. In accordance with the usual practice there are also provided in the rings openings (not shown) for the introduction of a thermometer and for escape of the excess of material upon the pressing of the plate.

It will be obvious from the arrangement of the bottoms 5 and 6 that when the plaster is fllled into the hollow spaces I2, l2 of the two halves l and 2 of the flask these bottoms can be replaced by other bottoms I and 8 (Fig. 4) so that the sensitive heating elements will not be damaged by the wet plaster.

What I claim as new and desire to secure by Letters Patent is:

1. A flask for dental purposes, comprising two rings designed to be disposed one upon the other, means carried by one ring upon each of two opposite sides for engagement across adjacent sides of the other ring preventing relative lateral movement of the rings, locking means between the ad jacent ends of the rings and upon opposite sides thereof, said locking means spaced in a plane passing thru the flask perpendicular to the plane of said first means and consisting at each side of the flask of a pair of ears each carried by a ring and a connection for each pair which is movable across the rings to connect or disconnect the ears whereby separation of the rings along their axial centers is prevented, a flat cover plate for and resting against the outer end of each ring, and means coacting with said first means by which the cover plates are held against sliding movement across the ends of the rings, but may move outwardly away therefrom.

2. A flask for dental purposes, comprising two rings designed to be disposed one upon the other,

bar members disposed transversely of opposite sides of one ring and set in recesses therein and secured thereto, the other ring having recesses transversely of opposite sides which aline with the first recesses for the reception of the bars, the said bars having their ends projecting beyond the ends of the rings, a bottom for each ring comprising a plate, the said bottoms being placed against and covering the outer ends of the rings and each bottom being formed to receive the adjacent extended ends of the bars to be maintained by the bars only against movement in a plane parallel with the adjacent end of the adjacent ring, each bottom being free to move lengthwise of the bars away from the adjacent ring, and looking means between the joining ends of the rings preventing separation of the rings lengthwise of the bars, comprising ears projecting from opposite sides of each ring and lying adjacent the ears of the other ring and a sliding connection between each two adjacent ears which is moved in a path transverse to the bars in connecting and disconnecting the ears.

HERBERT KONIGSMANN. 

